air condition LAND ROVER DISCOVERY 1999 Workshop Manual

AIR CONDITIONING
REFRIGERANT RECOVERY, RECYCLING AND RECHARGING 82-27
REFRIGERANT RECOVERY, RECYCLING AND RECHARGING
Refrigerant recovery, recycling and
recharging
$% 82.30.02
Recovery
1.Remove dust caps from high and low pressure
connectors.
2.Connect high and low pressure hoses to
appropriate connections.
3.Open valves on connectors.
4.Turn valves on refrigerant station to correct
positions.
Operate the refrigerant station in accordance
with the manufacturers instructions.
5.Turn Process switch to correct position.
6.Turn Main switch to 'ON'.
7.Allow station to recover refrigerant from
system.
WARNING: Refrigerant must always be
recycled before re-use to ensure that the
purity of the refrigerant is high enough for
safe use in the air conditioning system.
Recycling should always be carried out with
equipment which is design certified by
Underwriter Laboratory Inc. for compliance
with SAE J1991. Other equipment may not
recycle refrigerant to the required level of
purity.
A R134a Refrigerant Recovery Recycling
Recharging Station must not be used with
any other type of refrigerant.
Refrigerant R134a from domestic and
commercial sources must not be used in
motor vehicle air conditioning systems.
8.Close valves on refrigerant station.
9.Turn Main switch to 'OFF'.
10.Close valves on connectors.
11.Disconnect connectors high and low pressure
hoses from connectors.
12.Fit dust caps to connectors. 13.Open tap at rear of station to drain refrigerant
oil.
14.Measure and record quantity of refrigerant oil
recovered from system.
15.Close tap at rear of station.
Evacuation
WARNING: Servicing must only be carried
out by personnel familiar with both the
vehicle system and the charging and testing
equipment. All operations must be carried
out in a well ventilated area away from open
flame and heat sources.
1.Remove dust caps from high and low pressure
connectors.
2.Connect high and low pressure hoses to
appropriate connections.
3.Open valves on connectors.
4.Turn valves on refrigerant station to correct
positions.
5.Turn Process switch to correct position.
6.Turn Main switch to 'ON'.
7.Allow station to evacuate system.

AIR CONDITIONING
82-28REFRIGERANT RECOVERY, RECYCLING AND RECHARGING
Recharging
NOTE: When recharging, always make
allowance for refrigerant in the line between the
charging station and the vehicle. This is
calculated at 30 grammes/metre of charging
line. System charge weights are 700
± 25
grammes for front A/C system only and 900
±
25 grammes for combined front and rear A/C
system.
1.Close valves on refrigerant station.
2.Close valve on oil charger.
3.Disconnect yellow hose from refrigerant
station.
4.Remove lid from oil charger.
5.Pour same quantity of refrigerant oil into oil
charger as collected during recovery. If the
following components have been renewed, add
the following additional quantity of lubricating
oil:
lCondenser = 40 cm
3
lEvaporator = 40 cm3
lPipe or hose = 5 cm3/metre
lReceiver/dryer = 15 cm3.
6.Fit lid to oil charger.
7.Connect yellow hose to refrigerant station.
8.Open valve on oil charger.
9.Move pointer on refrigerant gauge to mark
position of refrigerant charge quantity.

+ CAPACITIES, FLUIDS,
LUBRICANTS AND SEALANTS, Capacities.
10.Slowly open correct valve on refrigerant station
and allow vacuum to pull refrigerant into
system.
11.Close valve on refrigerant station when correct
amount of refrigerant has been drawn into air
conditioning system.
12.Turn Main switch to 'OFF'.
13.Close valves on connectors.
14.Disconnect high and low pressure hoses from
connectors.
15.Fit dust caps to connectors.

AIR CONDITIONING
REPAIRS 82-29
REPAIRS
Compressor - diesel
$% 82.10.20
Remove
1.Remove engine acoustic cover.
2.Depressurise air conditioning system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.
3.Remove auxiliary drive belt.

+ CHARGING AND STARTING,
REPAIRS, Belt - auxiliary drive.
4.Drain cooling system.

+ COOLING SYSTEM - Td5,
ADJUSTMENTS, Drain and refill.
5.Disconnect multiplug from compressor.
6.Remove 2 bolts securing air conditioning pipes
to compressor and discard 'O' rings.
CAUTION: Always fit plugs to open
connections to prevent contamination.
7.Release clips and disconnect top hose from
coolant elbow and heater pipe.
8.Remove 4 bolts securing compressor to
mounting bracket.
9.Remove compressor.Refit
1.Calculate the quantity of refrigerant oil required.

+ GENERAL INFORMATION, Air
Conditioning Compressor Replacement.
2.Position compressor to mounting bracket and
tighten bolts to 25 Nm (18 lbf.ft).
3.Remove caps from compressor and pipe
connections.
4.Clean compressor and pipe connections.
5.Lubricate new 'O'rings with refrigerant oil and
fit to compressor.
6.Position A/C pipes to compressor and tighten
bolts to 10 Nm (7 lbf.ft) .
7.Connect multiplug to compressor.
8.Position top hose and secure with clips.
9.Refill cooling system.

+ COOLING SYSTEM - Td5,
ADJUSTMENTS, Drain and refill.
10.Fit auxiliary drive belt.

+ CHARGING AND STARTING,
REPAIRS, Belt - auxiliary drive.
11.Recharge air conditioning system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.
12.Fit engine acoustic cover.

AIR CONDITIONING
82-30REPAIRS
Compressor - V8
$% 82.10.20
Remove
1.Depressurise air conditioning system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.
2.Remove auxiliary drive belt.

+ CHARGING AND STARTING,
REPAIRS, Belt - auxiliary drive.
3.Disconnect multiplug from compressor.
4.Remove 2 bolts securing air conditioning pipes
to compressor and discard 'O' rings.
CAUTION: Always fit plugs to open
connections to prevent contamination.
5.Remove 4 bolts securing compressor to
mounting bracket.
6.Remove compressor.Refit
1.Calculate the quantity of refrigerant oil required.

+ GENERAL INFORMATION, Air
Conditioning Compressor Replacement.
2.Clean compressor dowels and dowel holes.
3.Position compressor to mounting bracket and
tighten bolts to 25 Nm (18 lbf.ft).
4.Remove caps from compressor and pipe
connections.
5.Clean compressor and pipe connections.
6.Lubricate new 'O' rings with refrigerant oil and
fit to compressor.
7.Position A/C pipes to compressor and tighten
bolts to 10 Nm (7 lbf.ft).
8.Connect multiplug to compressor.
9.Fit auxiliary drive belt.

+ CHARGING AND STARTING,
REPAIRS, Belt - auxiliary drive.
10.Recharge air conditioning system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.

AIR CONDITIONING
REPAIRS 82-31
Fan - condenser
$% 82.15.01
Remove
1.Remove front grille.

+ EXTERIOR FITTINGS, REPAIRS,
Grille - front - up to 03MY.
2.Remove 2 bolts securing bonnet platform RH
support stay.
3.Remove support stay.
4.Disconnect multiplug from condenser cooling
fan motor.
5.Remove 4 screws securing cooling fan cowl to
mounting bracket.
6.Remove cooling fan assembly and collect
spacing washers.
Refit
1.Fit condenser fan.
2.Fit spacing washers between fan cowl and
mounting bracket and secure with screws.
3.Connect multiplug to motor.
4.Fit bonnet platform support stay and secure
with bolts.
5.Fit front grille.

+ EXTERIOR FITTINGS, REPAIRS,
Grille - front - up to 03MY.
Condenser
$% 82.15.07
Remove
1.Recover refrigerant from A/C system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.
2.Remove radiator.
l

+ COOLING SYSTEM - Td5,
REPAIRS, Radiator.
l

+ COOLING SYSTEM - V8,
REPAIRS, Radiator.
3.Disconnect multiplug from dual pressure
switch.
4.Remove bolt securing evaporator pipe to
condenser.
5.Disconnect evaporator pipe from condenser
and discard 'O' ring.
6.Remove bolt securing evaporator pipe to
receiver drier.
7.Disconnect evaporator pipe from receiver drier
and discard 'O' ring.
CAUTION: Always fit plugs to open
connections to prevent contamination.

AIR CONDITIONING
82-32REPAIRS
8.Remove 3 remaining bolts securing cooling fan
support rails to condenser.
9.Remove condenser.
10.Remove bolt securing adaptor block to receiver
drier.
11.Remove adaptor block from receiver drier and
discard 'O' ring.
CAUTION: Always fit plugs to open
connections to prevent contamination.12.Remove bolt securing condenser pipe to
receiver drier.
13.Remove clamp bolt receiver drier to bracket
and remove drier from bracket.
14.Remove and discard 'O' ring from condenser
pipe.
CAUTION: Always fit plugs to open
connections to prevent contamination.
15.Remove 2 remaining bolts securing receiver
drier brackets and condenser LH mounting
bracket to condenser.
16.Remove mounting bracket assembly.
17.Remove remaining bolt securing condenser RH
mounting and remove mounting.
18.Remove sealing strip from outer upper seam of
condenser.
19.Remove captive nut plates from condenser.

AIR CONDITIONING
REPAIRS 82-33
Refit
1.Fit captive nut plates to new condenser.
2.Fit seal to condenser.
3.Fit RH mounting bracket to condenser and
secure with bolt.
4.Fit receiver drier bracket assembly and secure
with bolts.
5.Ensure condenser pipe and new receiver drier
connections are clean.
6.Lubricate new 'O' ring with refrigerant oil and fit
to condenser pipe.
7.Fit receiver drier to bracket and condenser
pipe. Tighten bolt securing condenser pipe to 5
Nm (3.7 lbf.ft). Fit clamping bolt securing
receiver drier to bracket and tighten to 5 Nm
(3.7 lbf.ft).
8.Ensure adaptor block and receiver drier
connections are clean.
9.Lubricate new 'O' ring with refrigerant oil and fit
to adaptor block.
10.Fit adaptor block to receiver drier and tighten
bolt to 5 Nm. (3.7 lbf.ft).
11.Fit condenser assembly.
12.Fit cooling fan to condenser and fit bolts to
secure support rails to condenser brackets.
13.Ensure connections of condenser, receiver
drier and evaporator pipes are clean.
14.Lubricate new 'O' ring seals with refrigerant oil
and fit one seal to each evaporator pipe.
15.Connect evaporator pipes and tighten bolts to 5
Nm (3.7 lbf.ft).
16.Connect multiplug to dual pressure switch.
17.Fit radiator.
l

+ COOLING SYSTEM - Td5,
REPAIRS, Radiator.
l

+ COOLING SYSTEM - V8,
REPAIRS, Radiator.
18.Recharge A/C system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.
Receiver drier and dual pressure switch
$% 82.17.03
Remove
1.Recover refrigerant from air conditioning
system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.
2.Remove front grille.

+ EXTERIOR FITTINGS, REPAIRS,
Grille - front - up to 03MY.
3.Disconnect multiplug from dual pressure
switch.
4.Remove bolt securing condenser pipe to
receiver drier.
5.Disconnect condenser pipe from receiver drier.
CAUTION: Always fit plugs to open
connections to prevent contamination.

AIR CONDITIONING
82-34REPAIRS
6.Remove bolt securing evaporator pipe to
receiver drier.
7.Disconnect evaporator pipe from receiver
drier.
CAUTION: Always fit plugs to open
connections to prevent contamination.
8.Remove bolt securing top of receiver drier
mounting bracket to condenser.
9.Remove bolt securing bottom of receiver drier
mounting bracket to condenser.
10.Remove receiver drier assembly. 11.Loosen mounting bracket clamping bolt.
12.Remove receiver drier from mounting bracket.
13.Remove dual pressure switch from receiver
drier
Refit
1.Fit dual pressure switch to receiver drier and
tighten to 10 Nm (7 lbf.ft).
2.Fit receiver drier to mounting bracket and
tighten clamping bolt.
3.Fit receiver drier assembly to condenser.
4.Fit bolts securing receiver drier mounting
bracket to condenser and tighten to 5 Nm (3.7
lbf.ft).
5.Remove caps from air conditioning pipes and
receiver drier.
6.Remove old 'O' rings from pipes.
7.Fit new 'O' rings to pipes and lubricate with
refrigerant oil.
8.Connect air conditioning pipes to receiver
drier.
9.Fit bolts securing air conditioning pipes to
receiver drier and tighten to 5 Nm (3.7 lbf.ft).
10.Connect multiplug to dual pressure switch.
11.Fit front grille.

+ EXTERIOR FITTINGS, REPAIRS,
Grille - front - up to 03MY.
12.Recharge air conditioning system.

+ AIR CONDITIONING, REFRIGERANT
RECOVERY, RECYCLING AND
RECHARGING, Refrigerant recovery,
recycling and recharging.

AIR CONDITIONING
REPAIRS 82-35
ECU - air temperature control
$% 82.20.90
Remove
1.Release radio from fascia.

+ IN CAR ENTERTAINMENT,
REPAIRS, Radio.
2.Working through radio aperture, release control
unit from fascia.
3.Disconnect 3 multiplugs and remove control
unit.
4.Collect bushes from control unit location pegs.
Refit
1.Fit bushes to new control unit.
2.Position control unit and connect multiplugs.
3.Fit control unit to fascia.
4.Fit radio to fascia.

+ IN CAR ENTERTAINMENT,
REPAIRS, Radio.
Sensor - ambient air temperature
$% 82.20.91
Remove
1.Remove front grille.

+ EXTERIOR FITTINGS, REPAIRS,
Grille - front - up to 03MY.
2.Release ambient air temperature sensor from
support bracket, disconnect multiplug and
remove sensor.
Refit
1.Position sensor, connect multiplug and secure
sensor to support bracket
2.Fit front grille.

+ EXTERIOR FITTINGS, REPAIRS,
Grille - front - up to 03MY.

AIR CONDITIONING
82-36REPAIRS
Sensor - solar light
$% 82.20.92
Remove
1.Carefully remove solar light sensor from fascia.
2.Disconnect multiplug from solar light sensor.
3.Remove solar light sensor. Refit
1.Connect multiplug to solar light sensor.
2.Position solar light sensor to fascia and push to
secure.